package collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        c.add(new Point(1, 2));
        c.add(new Point(3, 4));
        c.add(new Point(5, 6));
        c.add(new Point(7, 8));
        c.add(new Point(9, 0));
        c.add(new Point(1, 2));
        System.out.println(c);//[(1,2),(3,4),(5,6),(7,8),(9,0),(1,2)]

        Point p = new Point(1, 2);
        boolean contains = c.contains(p);
        System.out.println("是否包含：" + contains);//true

        /*
            boolean remove(Object o):----------------一般都不接收boolean结果
            从当前集合中删除与给定元素o的equals()比较为true的元素
            若存在重复则只删除第1次匹配的
         */
        boolean remove = c.remove(p);
        System.out.println("是否删除：" + remove);//remove
        System.out.println(c);//[(3,4), (5,6), (7,8), (9,0), (1,2)]
    }
}
